A method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed
By coordinating and controlling the amount and speed of rolling oil spraying, and adopting a single spraying method and low-speed winding technology, the problem of difficult control of the gloss of tin-phosphor bronze alloy was solved, achieving precise control of gloss and improvement of production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FUJIAN ZIJIN COPPER
- Filing Date
- 2026-04-27
- Publication Date
- 2026-06-26
AI Technical Summary
Existing technologies struggle to precisely control the gloss of tin-phosphor bronze alloys. The complex influence of factors such as raw material characteristics, surface roughness, processing parameters, ambient temperature and humidity, and the type and amount of additives makes it difficult to achieve the precision requirements of AOI (Automated Optical Inspection).
By coordinating and controlling the amount and speed of rolling oil spraying, the oil film thickness on the strip surface is adjusted in the final cold rolling pass using a single spraying method. Combined with low-speed coiling and source oil control, the gloss is precisely controlled.
It achieves precise control over the gloss of copper alloys, improves production quality and efficiency, and ensures the gloss stability of products within the 70 GU range.
Smart Images
Figure CN122273933A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of tin-phosphorus bronze alloy processing technology, specifically a method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed. Background Technology
[0002] As the manufacturing industry develops towards higher precision and higher quality, the requirements for product quality indicators such as dimensional accuracy and surface defects are becoming increasingly stringent. Traditional manual inspection can no longer meet current needs, and AOI (Automated Optical Inspection) is often used. However, AOI requires high gloss levels for the inspected objects. For example, the gloss level of the spring contacts in a charging adapter made of tin-phosphor bronze must be precisely controlled within the range of 70 GU to ensure smooth production processes and stable product quality. However, the gloss level of tin-phosphor bronze alloys is subject to complex influences from many factors such as raw material characteristics, surface roughness, processing parameters, ambient temperature and humidity, and the type and amount of additives, making it difficult to accurately control its gloss level. In view of this, a method for controlling the gloss level of copper alloys based on the coordinated regulation of rolling oil spray volume and speed is proposed. Summary of the Invention
[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed. This method can accurately control the gloss of copper alloys, adjust it according to requirements, and improve the quality and efficiency of production.
[0004] The above-mentioned technical objective of this invention is achieved through the following technical solution: a method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed, comprising the following steps: S1. Prepare copper alloy billets; S2. Anneal the copper alloy billet and mill the surface of the annealed billet; S3. The milled billet is rough rolled, and a double-spray method is used for spraying during the rough rolling. S4. Trim the edges of the strip after rough rolling in step S3, and then transfer it to an annealing furnace for stress-relieving annealing and heat preservation; S5. The strip after annealing in step S4 is subjected to multiple passes of intermediate rolling and alternating annealing, and then enters the final cold rolling pass; wherein, in both the intermediate rolling and the final cold rolling pass, rolling oil is sprayed by a single spray method. S6. The strip after the final cold rolling pass in step S5 is sequentially degreased and cleaned, annealed, cleaned again, and stretched and straightened, and finally sheared to obtain the finished product; In the final cold rolling pass of step S5, the oil film thickness on the strip surface is adjusted by coordinating the rolling speed and the amount of rolling oil sprayed, thereby precisely controlling the target gloss. The rolling speed of the final cold rolling pass is controlled at 100~280 m / min, and in conjunction with the single spray method, the thickness of the oil film entering the rolling deformation zone is effectively reduced.
[0005] In some embodiments, in the final cold rolling pass of step S5, the front tension is controlled to be 8~12MPa, the back tension is controlled to be 12~15MPa, and the surface roughness Ra of the rolls used is 0.25~0.35μm.
[0006] In some embodiments, the rolls used in the final cold rolling pass have an upper and lower roll deviation of ≤0.1μm and a single roll lateral deviation of ≤0.1μm; and the rolls undergo a series of grinding wheel dressing, rough grinding, semi-fine grinding and polishing with a feed rate of 0 before use.
[0007] In some embodiments, in step S1, the chemical composition of the copper alloy billet by weight percentage is: Sn 7.0%~8.0%, P 0.1%~0.3%, Al≤0.002%, Zn≤0.1%, Ni≤0.15%, Fe≤0.008%, Pb≤0.008%, with the balance being Cu; the copper alloy billet is prepared by horizontal continuous casting at a casting temperature of 1100~1200℃, using a pull-stop process at a casting speed of 140~180m / min. In some embodiments, in step S4, the annealing is a bell furnace stress-relief annealing, with a heating time of 3-6 hours, a holding time of 3-6 hours, and a temperature controlled at 480-560°C; in step S5, the alternating annealing process includes at least two online stress-relief annealings in an air cushion furnace, with the annealing temperature of the air cushion furnace controlled at 700-750°C.
[0008] In some embodiments, in step S6, the finished product annealing is low-temperature annealing in a bell furnace, with an annealing temperature of 200~260℃, a heating time of 3~6 hours, and a holding time of 3~6 hours; in the stretching and straightening process, the stretching speed is 100~200m / min, and the elongation is controlled at 0.2%~0.6%.
[0009] In some embodiments, step S5, the multi-pass intermediate rolling process, is specifically divided into two stages: In the first intermediate rolling stage, the strip is rolled from 2.5mm to 1.0mm in 4 passes. The rolling speed in this stage is controlled at 160~240m / min and the front and rear tension is controlled at 25~40KN. In the second intermediate rolling stage, the strip is rolled from 1.0mm to a final thickness of 0.358mm, with a total of 5 rolling passes. During this stage, the rolling speed is controlled at 200~340m / min, and the front and rear tensions are controlled at 12~20KN.
[0010] In some embodiments, during the rough grinding, semi-finish grinding and polishing processes of the roll, the grinding wheel speed is kept constant at 18 rpm, and as the grinding process progresses from the rough grinding to the polishing process, the roll speed increases from 32 rpm to 37 rpm, and the grinding wheel lateral displacement gradually decreases from 1200 to 400.
[0011] In summary, the present invention has the following beneficial effects: This invention reduces the oil film thickness directly from the physical source by forcibly converting the rolling oil spraying method from conventional dual spraying to single spraying. Simultaneously, by synergistically reducing the cold rolling speed of the final product pass, and utilizing the hydrodynamic lubrication effect, the amount of dynamic rolling oil brought into the rolling deformation zone per unit time is significantly reduced, further reducing the thickness of the rolling oil film. In other words, by using the synergistic dual control of spray volume limitation and hydrodynamic suction volume limitation, the smooth morphology of the roll surface can be more perfectly copied onto the strip surface, thereby significantly improving the surface gloss of the final product. It can precisely control the gloss of the finished strip, improving production quality and efficiency. Attached Figure Description
[0012] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a graph showing the grinding data of the rollers used in the roughing mill of this invention; Figure 3 This is a graph showing the grinding data of the rollers used in this invention; Figure 4 This is a graph showing the functional test data of the final product strip of this invention; Figure 5 This is a graph showing the comparative test data of rolling speed for this invention; Figure 6 This is a comparative test data chart of the cold rolling spraying amount of the present invention. Detailed Implementation
[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0014] See Figure 1-6A method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed includes the following steps: S1. Prepare copper alloy billets; S2. Anneal the copper alloy billet and mill the surface of the annealed billet; S3. The milled billet is rough rolled, and a double-spray method is used for spraying during the rough rolling. S4. Trim the edges of the strip after rough rolling in step S3, and then transfer it to an annealing furnace for stress-relieving annealing and heat preservation; S5. The strip after annealing in step S4 is subjected to multiple passes of intermediate rolling and alternating annealing, and then enters the final cold rolling pass; wherein, in both the intermediate rolling and the final cold rolling pass, rolling oil is sprayed by a single spray method. S6. The strip after the final cold rolling pass in step S5 is sequentially degreased and cleaned, annealed, cleaned again, and stretched and straightened, and finally sheared to obtain the finished product; In the final cold rolling pass of step S5, the oil film thickness on the strip surface is adjusted by coordinating the rolling speed and the amount of rolling oil sprayed, thereby precisely controlling the target gloss. The rolling speed of the final cold rolling pass is controlled at 100~280 m / min, and in conjunction with the single spray method, the thickness of the oil film entering the rolling deformation zone is effectively reduced.
[0015] In some embodiments, in the final cold rolling pass of step S5, the front tension is controlled to be 8~12MPa, the back tension is controlled to be 12~15MPa, and the surface roughness Ra of the rolls used is 0.25~0.35μm.
[0016] In some embodiments, the rolls used in the final cold rolling pass have an upper and lower roll deviation of ≤0.1μm and a single roll lateral deviation of ≤0.1μm; and the rolls undergo a series of grinding wheel dressing, rough grinding, semi-fine grinding and polishing with a feed rate of 0 before use.
[0017] In some embodiments, in step S1, the chemical composition of the copper alloy billet by weight percentage is: Sn 7.0%~8.0%, P 0.1%~0.3%, Al≤0.002%, Zn≤0.1%, Ni≤0.15%, Fe≤0.008%, Pb≤0.008%, with the balance being Cu; the copper alloy billet is prepared by horizontal continuous casting at a casting temperature of 1100~1200℃, using a pull-stop process at a casting speed of 140~180m / min. In some embodiments, in step S4, the annealing is a bell furnace stress-relief annealing, with a heating time of 3-6 hours, a holding time of 3-6 hours, and a temperature controlled at 480-560°C; in step S5, the alternating annealing process includes at least two online stress-relief annealings in an air cushion furnace, with the annealing temperature of the air cushion furnace controlled at 700-750°C.
[0018] In some embodiments, in step S6, the finished product annealing is low-temperature annealing in a bell furnace, with an annealing temperature of 200~260℃, a heating time of 3~6 hours, and a holding time of 3~6 hours; in the stretching and straightening process, the stretching speed is 100~200m / min, and the elongation is controlled at 0.2%~0.6%.
[0019] In some embodiments, step S5, the multi-pass intermediate rolling process, is specifically divided into two stages: In the first intermediate rolling stage, the strip is rolled from 2.5mm to 1.0mm in 4 passes. The rolling speed in this stage is controlled at 160~240m / min and the front and rear tension is controlled at 25~40KN. In the second intermediate rolling stage, the strip is rolled from 1.0mm to a final thickness of 0.358mm, with a total of 5 rolling passes. During this stage, the rolling speed is controlled at 200~340m / min, and the front and rear tensions are controlled at 12~20KN.
[0020] In some embodiments, during the rough grinding, semi-finish grinding and polishing processes of the roll, the grinding wheel speed is kept constant at 18 rpm, and as the grinding process progresses from the rough grinding to the polishing process, the roll speed increases from 32 rpm to 37 rpm, and the grinding wheel lateral displacement gradually decreases from 1200 to 400.
[0021] Taking the production process of C5210 high-tin phosphor bronze strip with tensile strength of 685-785MPa, yield strength ≥460MPa, hardness of 210-230HV, and gloss of 320-390GU as an example, the details are as follows: First, the preparation of the rolling mill rolls: as shown in the attached document. Figure 2-3 As shown, For roughing mill work rolls: the surface roughness Ra is required to be controlled between 0.7-0.9μm. The grinding process includes dressing the grinding wheel (grinding wheel speed 18 rpm, transverse 300°, feed rate 0.03, 5 passes), rough grinding (grinding wheel speed 16 rpm, roll speed 22 rpm, transverse 1300°, feed rate 0.006, 20 passes), and semi-finish grinding (grinding wheel speed 16 rpm, roll speed 22 rpm, transverse 900°, feed rate 0.003, 2 passes). For intermediate rolling and finished cold rolling work rolls: Ra is required to be controlled between 0.28-0.32μm, and the grinding process is subdivided into the following stages with the grinding wheel speed kept constant at 18 rpm: Dressing the grinding wheel: transverse 200, feed rate 0.02, 5 passes.
[0022] Rough grinding 1: Roller speed 32 rpm, transverse movement 1200, feed rate 0.004, 10 passes.
[0023] Rough grinding 2 / 3: Roller speed 32 rpm, transverse movement 1200, feed rate reduced to 0.003 and 0.001 respectively, 2 passes each.
[0024] Semi-finish grinding 1: The roll speed is increased to 37 rpm, the transverse movement is reduced to 900, the feed rate is 0.001, and it is done in 1 pass.
[0025] Semi-finish grinding 2: Roll speed 37 rpm, transverse movement further reduced to 600, feed rate 0.001, 1 pass.
[0026] Polishing: The roller speed is 37 rpm, the transverse movement is reduced to the minimum of 400, the feed rate is 0 (no feed sparks flow out during grinding), and one polishing pass is performed.
[0027] Next, smelting and horizontal continuous casting: the raw materials are batched and smelted, with the chemical composition strictly controlled as follows: Sn 7.0%~8.0%, P 0.1%~0.3%, Al≤0.002%, Zn≤0.1%, Ni≤0.15%, Fe≤0.008%, Pb≤0.008%, with the balance being Cu. Horizontal continuous casting technology is adopted, with the casting temperature set at 1100℃-1200℃. A pull-stop process is used to ensure the stability of the crystallization interface. The casting speed is controlled at 140m / min~180m / min, and the produced billet size is 16mm thick × 430mm wide.
[0028] Then, rough rolling, homogenization annealing, and milling are performed: the 16mm thick billet is fed into the rough rolling mill and rolled to 13mm in one pass at a speed of 80-120m / min, with the front tension controlled at 10-30MPa and the rear tension at 50-80MPa. The roughness of the rough rolling rolls is 0.6-1.0μm. Next, the 13mm billet enters the roller hearth furnace for homogenization annealing at a temperature of 680±30℃ and an exit temperature of 50-150℃, with a cycle time of 1-3m / min, in order to eliminate dendrite segregation. After exiting the furnace, the billet is transferred to a milling machine for four-sided milling, removing 0.5-1.5mm from the top and bottom and 1-3mm from each of the two sides, to obtain a clean strip billet with a thickness of approximately 14.5mm.
[0029] Next, rough rolling and primary annealing are carried out: the milled strip is transferred to the roughing mill and rolled from 14-15mm to 2.5mm in 7 passes at a rolling speed of 80-150m / min, with the tension controlled at 30-60KN. Since the main purpose at this time is to quickly reduce the thickness, there is no need to strictly control the gloss. Therefore, a double-spray method is used to fully lubricate and cool the strip, and rolls with a roughness of 0.6-1.0μm are used. After rolling to 2.5mm, a rough trimming process is carried out to remove the broken edges on both sides that are prone to cracking. 5-10mm is removed from each side. Then, the strip is transferred to a bell furnace for stress-relief annealing, which involves heating for 3-6 hours, holding for 3-6 hours at a temperature of 480-560℃ to restore the plasticity of the material.
[0030] Then, multiple passes of intermediate rolling and alternating annealing are performed: The first intermediate rolling stage: After annealing in a bell furnace, the strip is rolled from 2.5mm to 1.0mm, with the specific pass allocation as follows: 2.5 -> 1.79 -> 1.45 -> 1.19 -> 1.0mm, for a total of 4 passes. The rolling speed is increased to 160-240m / min, and the tension is 25-40KN. To lay the foundation for subsequent gloss, the spraying method is switched to single spraying in this stage, and the rolls are replaced with rolls with a roughness of 0.24-0.36μm. After rolling to 1.0mm, the strip is transferred to an air cushion furnace for online rapid annealing (temperature 700-750℃, speed 25-30m / min, fan speed 1000-1200r / min).
[0031] The second intermediate rolling stage: After annealing in an air cushion furnace, the thickness is rolled from 1.0 mm to 0.358 mm (leaving a base thickness). The specific passes are: 1.0 -> 0.66 -> 0.53 -> 0.455 -> 0.4 -> 0.358 mm, for a total of 5 passes. The rolling speed is 200-340 m / min, and the tension is controlled at 12-20 kN. Single spraying is used, and the roll Ra is 0.3-0.36 μm. After rolling to 0.358 mm, it is transferred to an air cushion furnace for annealing again (temperature 700-750℃, speed 50-70 m / min, fan speed 1200-1400 r / min).
[0032] Then, the final cold rolling pass for finished products is controlled through coordinated regulation: the strip is cold rolled from a minimum thickness of 0.358 mm in a single pass to a finished thickness of 0.25 mm. In the final cold rolling pass for finished products, intervention is carried out through a coordinated regulation mechanism. Speed control: The rolling speed is strictly controlled at 100-280m / min. Compared with 340m / min in the intermediate rolling stage, the significantly reduced linear speed greatly weakens the dynamic pressure entrainment effect of rolling oil at the entrance of the wedge deformation zone, resulting in less oil entering the deformation zone. Spray volume control: A single spray mode is adopted to reduce the amount of excess oil on the strip surface from the physical pumping source. Tension and interface matching: control the front tension to 8-12MPa and the back tension to 12-15MPa, and use polished rolls with a roughness of Ra0.25-0.35μm. The deviation between the upper and lower rolls and the transverse deviation of the rolls are both ≤0.1μm. Through the synergistic effect of "low-speed winding and suction + source oil control", the oil film thickness on the strip surface is squeezed to the limit. Under the action of rolling pressure, the smooth surface of the roll is almost undamaged and "imprinted" onto the copper strip surface, eliminating micro-pits.
[0033] Post-processing: After the strip is rolled to a finished thickness of 0.25mm, a small amount of grease will inevitably remain on the surface of the finished product. It is then transferred to the cleaning line for degreasing and cleaning, and then transferred to the bell furnace for low-temperature annealing to eliminate internal stress without affecting the mechanical properties. The annealing temperature is 200-260℃, and the heating and holding time is 3-6 hours. After annealing, it is cleaned again by the cleaning line and then enters the tension straightening unit (tension straightening). The tension straightening speed is 100-200m / min, and the elongation is controlled at a trace amount of 0.2-0.6% to ensure extremely high flatness of the strip. Finally, it is transferred to the finished product shearing machine for slitting, packaging and warehousing.
[0034] Finally, the finished product was tested, and the test results for each indicator are attached. Figure 4 As shown, the method for preparing copper alloys allows for precise control of the gloss level, which can be adjusted according to requirements, thus improving production quality and efficiency.
[0035] In addition, this application has conducted numerous comparative verification experiments, the specific data of which are listed below: Argument 1: Analysis of the Influence of Cold Rolling Speed on Gloss Under the condition that the strip thickness is 0.2 mm and a uniform single spray mode is used, the surface characteristics of the strip at two speeds of 150 m / min and 250 m / min are compared. Experimental data are attached. Figure 5 As shown: When the rolling speed reaches 250 m / min, due to the strong hydrodynamic pressure effect, the oil film entrained in the deformation zone is thicker. The experimental results show that the surface roughness of the 9 strips is distributed between 0.138 and 0.154 μm, and the corresponding strip gloss fluctuates between 414.8 and 443.8 GU. The average gloss is low and not stable enough. When the rolling speed was systematically reduced to 150 m / min, the amount of oil absorbed by the dynamic pressure decreased sharply. Although the surface roughness of the nine strips measured in the experiment was within a certain range of 0.1228~0.1654 μm, more importantly, the gloss achieved an overall leap, with the data stably distributed between 453.4~482.0 GU. This proves that reducing the cold rolling speed can reduce the oil film thickness, thereby significantly improving and stabilizing the gloss of the copper material. Argument 2: Analysis of the Influence of Spray Volume on Gloss While maintaining a high rolling speed of 250 m / min and a strip thickness of 0.2 mm, the effects of single-spray and dual-spray strategies on the final optical surface were compared. Experimental data are attached. Figure 6 As shown: When the traditional dual-spray full-oil supply mode is used, there is a large amount of excess lubricating oil between the roll and the strip. Eight sets of test data show that the strip roughness is between 0.162 and 0.193 μm and the strip gloss is between 389 and 432 GU. However, when the single-spray oil supply mode is used, the strip gloss is between 432 and 465 GU. The data from 8 sets of comparisons showed that although the roughness of the strip (0.168~0.192μm) did not change by a sudden magnitude, the gloss was steadily improved by using a single spray method due to the elimination of micro-oil pits; this proves that reducing the thickness of the oil film can directly and effectively improve the surface gloss of the copper strip.
[0036] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.
Claims
1. A method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed, characterized in that: Includes the following steps: S1. Prepare copper alloy billets; S2. Anneal the copper alloy billet and mill the surface of the annealed billet; S3. The milled billet is rough rolled, and a double-spray method is used for spraying during the rough rolling. S4. Trim the edges of the strip after rough rolling in step S3, and then transfer it to an annealing furnace for stress-relieving annealing and heat preservation; S5. The strip after annealing in step S4 is subjected to multiple passes of intermediate rolling and alternating annealing, and then enters the final cold rolling pass; wherein, in both the intermediate rolling and the final cold rolling pass, rolling oil is sprayed by a single spray method. S6. The strip after the final cold rolling pass in step S5 is sequentially degreased and cleaned, annealed, cleaned again, and stretched and straightened, and finally sheared to obtain the finished product; In the final cold rolling pass of step S5, the oil film thickness on the strip surface is adjusted by coordinating the rolling speed and the amount of rolling oil sprayed, thereby precisely controlling the target gloss. The rolling speed of the final cold rolling pass is controlled at 100~280 m / min, and in conjunction with the single spray method, the thickness of the oil film entering the rolling deformation zone is effectively reduced.
2. The method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed according to claim 1, characterized in that: In the final cold rolling pass of step S5, the front tension is controlled to be 8~12MPa, the back tension is controlled to be 12~15MPa, and the surface roughness Ra of the rolls used is 0.25~0.35μm.
3. The method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed according to claim 2, characterized in that: The rolls used in the final cold rolling pass have an upper and lower roll deviation of ≤0.1μm and a single roll lateral deviation of ≤0.1μm; and the rolls undergo a series of grinding, rough grinding, semi-fine grinding and polishing processes with a feed rate of 0 before use.
4. The method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed according to claim 1, characterized in that: In step S1, the chemical composition of the copper alloy billet by weight percentage is: Sn 7.0%~8.0%, P 0.1%~0.3%, Al≤0.002%, Zn≤0.1%, Ni≤0.15%, Fe≤0.008%, Pb≤0.008%, with the balance being Cu; the copper alloy billet is prepared by horizontal continuous casting at a casting temperature of 1100~1200℃, using a pull-stop process with a casting speed of 140~180m / min.
5. The method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed according to claim 1, characterized in that: In step S4, the annealing is a bell furnace stress-relief annealing, with a heating time of 3-6 hours, a holding time of 3-6 hours, and a temperature controlled at 480-560℃; in step S5, the alternating annealing process includes at least two online stress-relief annealings in an air cushion furnace, with the annealing temperature of the air cushion furnace controlled at 700-750℃.
6. The method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed according to claim 1, characterized in that: In step S6, the finished product annealing is low-temperature annealing in a bell furnace, with an annealing temperature of 200~260℃, a heating time of 3~6 hours, and a holding time of 3~6 hours; in the bending and straightening treatment, the bending speed is 100~200m / min, and the elongation is controlled at 0.2%~0.6%.
7. The method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed according to claim 1, characterized in that: In step S5, the multi-pass intermediate rolling process is specifically divided into two stages: In the first intermediate rolling stage, the strip is rolled from 2.5mm to 1.0mm in 4 passes. The rolling speed in this stage is controlled at 160~240m / min and the front and rear tension is controlled at 25~40KN. In the second intermediate rolling stage, the strip is rolled from 1.0mm to a final thickness of 0.358mm, with a total of 5 rolling passes. During this stage, the rolling speed is controlled at 200~340m / min, and the front and rear tensions are controlled at 12~20KN.
8. The method for controlling the gloss of copper alloys based on the coordinated regulation of rolling oil spray volume and speed according to claim 3, characterized in that: In the rough grinding, semi-finish grinding and polishing processes of the roll, the grinding wheel speed is kept constant at 18 rpm, and as the grinding process progresses from the rough grinding to the polishing process, the roll speed increases from 32 rpm to 37 rpm, and the grinding wheel lateral displacement gradually decreases from 1200 to 400.